How to Crack Evs’ Rare-Earth Metal Problem | Autocar

We’re Moving Away from Heat Engines with the Transition from ice Cars to Evs, but heat still plays a big part in the performance and wellbeing of all Electric Cars.

With that in mind, Continental has developed a device called an e-motor Rotor Rotor Temperature Sensor (Erts), which monitors temperature more across more across than software-back Rare-Earth Material Used In Permanent Magnet Synchronous Motors.

Batteries, Motors and Inverters All Generate Heat Due to the power they are handling and the majority of them use liquid cooling.

MOST EVS also use permanent magnet motors that have rare-earth magnets embedded in the rotors. Although some manufacturers have chion to substitute Permanent Magnets for Electromagnetic Windings in the Rotor, Rare-Earth Permanent Magnets Have Traditionally Been the go-To Solorn to Achie And Efficiency.

However, the environmental impact of extraction and processing them is significant. The current geopolitical turmoil is also raising concerns over suply and most of them come from china, so alternatives-like asynchronous magnet -free motors-Or using of them are using of them aray advantage.

Permanent magnets also have a vulnerability: overheating. If magnetized Material Reaches a Certain Temperature Known as the curie point, which varies depending on the material, it can become demagnetised. If that happens to the magnets in an ev motor, then the performance will at least diminish and at all the motor will fail.

The heat of rotors today is not measured directly but calculated by algorithms developed through simulation and based on temperatures recorded by a sensor on the stator Move).

Being the temperature is called rather than directly measured, manufacturers leave Rise to Around 150deg C, So to Protect Magnets from Demagnetisation, Enough Rare-Earth Elements must be used to cover the entreire tolerance range and ensure the magnets don Bollywood.

Using a temperature sensor is much more precise. It reduces that margin to only 3deg c and enables the use of less rare-earth material.

The Erts is a Clever Device in other ways, too, and can generate its oven power. It’s in two parts. One is a mote sensor (Mote means small particle) Embedded in the rotor, which senses the temperature of the magnets.